Clean Water Act discharge permit · NPDES IN0021491
DUNKIRK WWTP, Millgrove, IN: NPDES IN0021491 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 27Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
- 1Inspections on file
- 0Formal enforcement actions
DUNKIRK WWTP holds NPDES permit IN0021491, which discharges to Mississinewa R/Big Lick/Dunkirk Dr.. EPA’s file records it issued July 20, 2018 and expiring December 31, 2023.
DUNKIRK WWTP, Millgrove, Indiana: Individual permit IN0021491; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued July 20, 2018, term to December 31, 2023, by IDEM; discharges to MISSISSINEWA R/BIG LICK/DUNKIRK DR..
- Nitrogen, ammonia total [as N]: 8 limits, 117 violations of any kind, 105 effluent exceedances, latest February 28, 2026, largest 886% over the limit.
- Chloride [as Cl]: 4 limits, 54 violations of any kind, 52 effluent exceedances, latest July 31, 2026, largest 108% over the limit.
- Solids, total suspended: 8 limits, 49 violations of any kind, 34 effluent exceedances, latest May 31, 2026, largest 200% over the limit.
- Chlorine, total residual: 4 limits, 34 violations of any kind, 28 effluent exceedances, latest June 30, 2015, largest 1,733% over the limit.
- Phosphorus, total [as P]: 2 limits, 11 violations of any kind, 11 effluent exceedances, latest July 31, 2026, largest 30% over the limit.
- E. coli, colony forming units [CFU]: 3 limits, 8 violations of any kind, 6 effluent exceedances, latest May 31, 2005, largest 330% over the limit.
- pH: 2 limits, 12 violations of any kind, 2 effluent exceedances, latest February 28, 2017.
- Oxygen, dissolved [DO]: 1 limit, 8 violations of any kind, 2 effluent exceedances, latest September 30, 1999, largest 7% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 8 limits, 16 violations of any kind, 1 effluent exceedance, latest May 31, 2004, largest 15% over the limit.
- Flow, in conduit or thru treatment plant: 1 limit, 9 violations of any kind, 0 effluent exceedances.
- Number of Events: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Hardness, total [as CaCO3]: 1 limit, 2 violations of any kind, 0 effluent exceedances.
- Sulfate, total [as SO4]: 1 limit, 2 violations of any kind, 0 effluent exceedances.
- Flow, total: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Copper, total recoverable: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Toxicity [acute], Ceriodaphnia dubia: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Toxicity [chronic], Ceriodaphnia dubia: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Toxicity [acute], Pimephales promelas [Fathead Minnow]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Toxicity [chronic], Pimephales promelas [Fathead Minnow]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Oil and grease, hexane extr method: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Copper, dry weight: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Cadmium, dry weight: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Molybdenum, sludge, total, dry weight [as Mo]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Zinc, sludge, total, dry weight [as Zn]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Lead, sludge, total, dry weight [as Pb]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Nickel, sludge, total, dry weight [as Ni]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Mercury, sludge, total, dry weight [as Hg]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- October 26, 2026: Failure to enforce against pass through and/or interference (Level I) (ST6).
- October 26, 2026: Effluent Violations - Numeric effluent violation (ST6).
- October 26, 2026: Evaluation (S).
- October 26, 2026: Notice of Noncompliance Issued (State).
Indiana holds 541 Publicly owned treatment works coverages of this permit type in EPA’s file; 220 were issued before IN0021491.
Coverages issued nearest IN0021491
- July 10, 2018: LAFAYETTE WWTP, Lafayette, IN0032468
- July 10, 2018: CARBON WWTP, Carbon, IN0039829, held by CARBON WASTEWATER TREATMENT PLANT
- July 10, 2018: LA CROSSE WASTEWATER TREATMENT PLANT, La Crosse, IN0040193, held by LACROSSE WASTEWATER TREATMENT PLANT
- July 10, 2018: MENTONE WWTP, Mentone, IN0040347
- July 10, 2018: ANDERSON TOWNSHIP REGIONAL SEWER DISTRICT, Milroy, IN0109746, held by ANDERSON TOWNSHIP RSD
- July 20, 2018: JEFFERSONVILLE NORTH WATER RECLAMATION FACILITY, Jeffersonville, IN0063673
- August 2, 2018: DYER WASTEWATER TREATMENT PLANT, Dyer, IN0039331
- August 2, 2018: CONVERSE WWTP, Converse, IN0039888
- August 2, 2018: ELNORA WASTEWATER TREATMENT PLANT, Elnora, IN0039985
- August 16, 2018: EATON WWTP, Eaton, IN0021652, held by EATON WWTP
DUNKIRK WWTP among its neighbors
EPA’s permit file holds 1 discharge permits in the Cowboy Run-Brooks Creek subwatershed (HUC 051201020106), IN0021491 among them. Its county holds 17, 1 of them major permits; IN0021491 is a minor permit.
Identity
| Facility as filed | DUNKIRK WWTP |
|---|---|
| Permittee as filed | DUNKIRK WWTP |
| NPDES ID | IN0021491 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | July 20, 2018 |
| Expiration date | December 31, 2023 |
| Issuing agency | IDEM |
| Address | Millgrove, IN 47336 |
| Receiving water | MISSISSINEWA R/BIG LICK/DUNKIRK DR. |
| Subwatershed | Cowboy Run-Brooks Creek (HUC 051201020106) |
| Program components on file | Biosolids, POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
Effluent limits and exceedances
- 27Pollutants on file
- 27Under a numeric limit
- 14With a violation of any kind
- 9With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 8 | 117 | 105 | February 28, 2026 | 886% over the limit |
| Chloride [as Cl] | 4 | 54 | 52 | July 31, 2026 | 108% over the limit |
| Solids, total suspended | 8 | 49 | 34 | May 31, 2026 | 200% over the limit |
| Chlorine, total residual | 4 | 34 | 28 | June 30, 2015 | 1,733% over the limit |
| Phosphorus, total [as P] | 2 | 11 | 11 | July 31, 2026 | 30% over the limit |
| E. coli, colony forming units [CFU] | 3 | 8 | 6 | May 31, 2005 | 330% over the limit |
| pH | 2 | 12 | 2 | February 28, 2017 | |
| Oxygen, dissolved [DO] | 1 | 8 | 2 | September 30, 1999 | 7% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 8 | 16 | 1 | May 31, 2004 | 15% over the limit |
| Flow, in conduit or thru treatment plant | 1 | 9 | 0 | ||
| Number of Events | 2 | 4 | 0 | ||
| Hardness, total [as CaCO3] | 1 | 2 | 0 | ||
| Sulfate, total [as SO4] | 1 | 2 | 0 | ||
| Flow, total | 1 | 1 | 0 | ||
| Copper, total recoverable | 4 | 0 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 2 | 0 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 2 | 0 | 0 | ||
| Oil and grease, hexane extr method | 1 | 0 | 0 | ||
| Copper, dry weight | 1 | 0 | 0 | ||
| Cadmium, dry weight | 1 | 0 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 1 | 0 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 1 | 0 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 1 | 0 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 1 | 0 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 1 | 0 | 0 |
Inspections, violations and enforcement
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| October 26, 2026 | Failure to enforce against pass through and/or interference (Level I) | ST6 |
| October 26, 2026 | Effluent Violations - Numeric effluent violation | ST6 |
Inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| October 26, 2026 | Evaluation | S |
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
| Date | What EPA recorded | Agency |
|---|---|---|
| October 26, 2026 | Notice of Noncompliance Issued | State |
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.